The Viva columns are based on a wide pore material designed for optimal large-molecule separations. The commercial wide-pore silicas meet the standard 300 Å mean pore size, most have very broad ...
There's much to enjoy about the retirement years - and you don't need a million dollars to do so. Photo / 123rf Q: I quit my job to look after my terminally ill husband. I am 62 years old. We have ...